Vacuum cleaner



De 14, 1937- F. RIEBEL, JR., Erm.l

l VACUUM CLEANER Filed. Nov. 9, 1934 4 Sheets-Sheet 1 :Snnentors 1Q/Ml,

E imm@ De. 14, 1937. F. RIEBEL, JR., Er AL 2,102,221

VACUUM CLEANER Filed Nov. 9, 1934 l 4 sheets-sheet 2 Q3 B @0% N vs N ' S Q 'LQ f Q Dec. 14, A1937. F. RlEl-BEI.. JR., ET Al. 2,102,221

VACUUM CLEANER Filed Nov. 9, 1934 4 Sheets-Sheet .'5

Dec. 14, 1937. RIEBEL, JR" ET AL 2,102,221

VACUUM CLEANER Filed Nov. 9, 1934 4 Sheets-Sheet 4 Supentor g/ipbe) 5U )ew qu. our

Patented Dec. 14,1937

VACUUM CLEANER l Frederick Riebel, Jr., and Dewey M. Dow, Toledo,'

Ohio, assignors to Air-Way Electric Appliance Corporation, Toledo, Ohio, a corporation of Delaware Application November 9, 1934, serial No. 752,270

Claims.

This invention relates to vacuum cleaners ofv the type in which the suction fan is rigidly atA tached to the handle, and separated from the,

floor tool or suction head, by a swively joint allow- 5 ing the handle to be rotated about its own axis. The general object of the invention is to provide, in this type of cleaner, a motor driven rotary agitator in the suction head. Another object is to provide a vacuum cleaner having a motor l.) driven agitator which may be manually adjusted toward or from the carpet by simply lifting or lowering the handle. To the accomplishment of these ends, the invention contemplates .the use of a secondary motormounted directly upon the 13 suction head and independent of the prime mover that drives the suction fan.v

` Another object is to provide such an arrangement permitting disconnection of the :door tool from the suction neck and detachment of the auxiliary conductor.

Another object is to provide a novel arrangement of suction head with rotary agitator and driving motor, the arrangement being such as to permit the use of a belt drive in which the belt is not twisted whereby a very heavy type of flat belt, capable of long wear and incapable of getting out of adjustment, may be employed.

Another object is to provide suitable means for housing said belt and for preventing the same from carrying dirt from the suction chamber of the floor tool into said housing means.

Another object is to provide a novel andimproved means for detachably securing the belt housing cover in place.

A further object is to provide a novel and improved arrangement for ventilation of the agitator drive motor.

Another object is to provide an improved detachable mounting connecting the agitator to the suction head, providing extreme stability of position for the agitator axis without sacrificing the ease with which the agitator may be snapped intov or out ofthe retaining means.

Another object is to provide an improved novel suction head construction, in which a smooth sliding contact with the suspended rug is provided by polished non-corrosive metal lips embracing the lower edges of the front and rear Walls of the suction head casting (preferably of .50 Valuminum for lightness) so as to avoid undue resistance to the sliding of the suction head over the rug held against it by suction, and wherein the regions of the rug 'directly beneath the corners of the suction head are depressed out of 55 contact with such corners by the supporting rollers at thek rear, and by toe rollers at the front, which effectively preventv any of said corners catching against the rug either during forward or backward movement ofthe cleaner. In this connection, it is the object also to slightly unseal `5` the rug at theends and particularly at the corners of the floor tool so as to prevent the undue cutting oi of the air ow through the suction head.

In the drawings: 10 v Fig. 1 is a right side elevation of a vacuum cleaner embodying our invention.

Fig. 2 is a plan view of the same. Fig. 3 is a transverse sectional view through the dust collector. 15

Fig. 4 is a detail venlarged cross section of a portion of the contiguous walls of the dust collector.

Fig. 5 is a similar view of a modiflcation thereof.-

Fig. 5a is -a plan view ci a section of the paper material used in the inner bag.

Fig. 6 is a front elevation of the oor tool of the cleaner.

Fig. 'l is an inverted plan view of the floor tool. 25

Fig. 8 is a rear elevation ci the iloor tool, portions being shown in section.

Fig. 9 is a longitudinal sectional View through the floor tool viewed from' the front taken on the line 9 9 oi Fig. 15. 30

Fig. l0 is a cross section through the oor tool taken on the line i-iii of Fig. 6.

Fig. 1l is the same as Fig. 10 with the exception that the nozzle height `,adjusting lever and the agitator end bearing are removed. 35

Fig. 11a is a view similar to Fig. 11 of a modified form of crank axle mounting.

Fig. 12 is a plan view of the left end of the oor tool adjustable support.

Fig. 13 is a horizontal sectional View through 40 the right end of the oor tool adjustable support.

Fig. 14 is a cross section through the oor tool taken on the line M-M of Fig. 6.

Fig. l5 is a cross section through the iioor tool taken on the line it-i of Fig. 6 looking toward 45 the right end of the viloor tool.

Fig. 16 is a cross section through the iioor tool taken on the line iii-' i of Fig. 6 looking toward the left end of the iioor tool.

Fig. 17 is a central cross section through the iioor tool taken on the line ill-'Il of Fig. 6.

Fig. 18 is a cross section, enlarged, through a portion of the agitator illustrating one of the beater elements and its mounting.

i upwardly and rearwardly (see Fig. 17).

Fig. 19 is a perspective view of one of the beater elements.

Fig. 20 is a longitudinal sectional view through one end region of one of the beater elements.

Fig. 21 is a sectional view through the belt housing takenlon the line 2I-2I of Fig. 14.

Fig. 22 is a cross section through the belt housing taken on the line 22-22 of Fig. 16.

Referring now to Fig. 1 of the drawings, the specic embodiment of our invention therein illustrated comprises a prime mover in the form of an electric motor I0 secured to a fan casing II in which is a suction producing fan which draws air into the fan casing II through a suction inlet I2 or I2aand a valve chamber I3 controlled by a transparent topped rotatable valve element I4. v

In the suction inlet I2 is socketed a suction neck I5. In the suction inlet I2a is socketed a hollow handle I6. To the suction neck I5 and motor I8 a floor tool A is attached by means of a swivel joint and auxiliary conductor B. Below the handle I6 is suspended the dust collector C. Secured to the upper region of the handle I6 is the current supply and controlling mechanism D which includes an extension cord I1 adapted to be attached to a source of current supply. A main conductor I8 is plugged at I9 into the switch assembly 20, extends downwardly between the handle I5 and the dust collector C, and at its other end is connected to the motor I0.

The door tool A includes a suction head 22,

Ipreferably of cast aluminum. The head 22 provides an elongated agitator chamber 23, substantially semi-cylindrical in cross section above the agitator axis a (see Fig. 11). Below the plane of the agitator axis a, the suction chamber is dened between two substantially parallel upright lips 24. The upper region of the suction head in the rear is gradually broadened out from the ends to the center -thereof as at 25, merging into a central neck 26 the axis of which extends Also centered between the ends of the suction head is a flattened region 21 in the top portion of the wall of the head upon which is mounted the housing 28 of the agitator drive motor. Screws 29 extended upwardly through the top wall 21 and threaded into the base of the motor housing 28, secure the same in place. .A machined t between the housing 28 and the top wall 21 makes the joint substantially air tight. 'I'he front wall of the central region of the head 22 and the front wall of the motorfhousing 28 are formed on a continuous -'curve, and the machined t joins these curves so as to substantially seal the junction thus adding to the appearance of the iloor tool.

The lower region of the suction chamber, defined between the lips 24, provides a space, rectangular in plan, into which the region of the rug directly below the suction chamber may be slightly drawn, into the path of the rotating agitator, and conilnes the air currents which play around the lower half of the agitator to an upward direction of ilow, thereby increasing the eillciency of operation of the agitator. In this connection it may be noted that the agitator roe tates in the direction indicated by the arrows'll and the air currents ilow as indicated bythe arrows 3|. Cooperating to secure this result`v is the-tangency of the regions 25 with the curved upperregion of the suction .chamber 23. The convergingv regions 25 of thevsuctiofn head allow the suction in the neck 28'to bel impressed substantially uniformly upon the entire length of the suction chamber.

Referring now to Fig. 9 in conjunction with Fig. 17, the agitator motor comprises the held coils 32 suitably mounted as on bolts 33 in the casing 28, and the armature 34, mounted on the shaft 35 one end of which is journalled in a bearing in one end of the casing 28 and the other end of which is journalled in a belt housing cover 38 is detachably secured to the belt housing rim 36, and forms together with the end of the motor casing 28, a housing for the belt. A partition 39 extends transversely Within the casing 28 so as to divide the same into a large chamber in which is located the armature 34 and elds 32 and a smaller chamber from which air is drawn by the fan 40 mounted on the shaft 35. ters this. small chamber through ventilation openings 4I in the casing 28, and leaves the large chamber through ventilation openings 42 in the casing 28. The opening 43 in which the fan 40 revolves is of about the same diameter as the armature 34 so that the air stream leaving the fan 4I) is concentrated on the space between the armature and the elds. The circulation of air through the motor is strengthened by the suction in the suction chamber 23, impressed against the far end of the large chamber in the motoryhousing through an opening 44 extending through both the top wall 21 of the suction head and the bottom wall of the housing 28. The opening 44 is located beyond the far side of the eld coils 32 so as to assist in the creation of air flow axially between the armature and field coils. Where the discharge openings 42 are present, the actual function of the suction opening 44 is to reduce any pressure Within the motor casing that may be built up by the resistance of the end wall thereof to the air current propelled by the fan so that the fan 4l) does not have to overcome this resistance in discharging the air currents through the openings 42.

The rotary agitator comprises a hub 45 preferably of cast aluminum the ends of which are recessed as at 48 to receive the ends of the bearing caps41. Secured in the latter are bushings 48 of an oil saturated metal material and the axle studs 49 of the agitator are journalled in the bushings 48. The axle studs 49 are pressed into the ends of the hub 45.

The bearing caps 41 are mounted in channels 50 formed in the ends of the suction head, and are secured in seatingrelation with said channels by spring clips 5I. The side arms of the clip 5I embrace the area defined by channel 50 and are formed with arched portions 52 to engage the bearing cap and diverging end portions 53 to receive the bearing cap when the same is being inserted andto cause the arms to spring apart when the bearing cap is pressed upwardly thereagainst.k The upper ends of the recesses 5U are semi-circular as at 54 and the arched portions 52 hold the bearing caps securely seated against these semi-circular shoulders 54. The side shoulders of the recess 50 prevent the agitator from being displaced either forwardly or backwardly and the shoulder 54 prevents the agitator from being displaced upwardly to any appreciable extent. Accordingly, no matter what might be contacted by the agitator during rotation, it would be impossible for the agitator to be moved out of its axis lof rotation. It is thereby assured that there is no possibility of the agitator assuming a position where .the beater elements can contact any` portion ofthe suction head or where the CII Air endrivebelt will rub againstany xed portion of the apparatus or where cleaning eiciency would be impaired. The position of the agitator axis relative to the suction mouth is rigidly fixed so that the most delicate adjustments o f the agitator relative to the rug may be made by varying the height of the floor tool. The clips are secured in sockets 51a. formed in the ends of the Y be formed either in the edge of the cover 38 or in the top wall 21. The opening 59 is directly opposite the reaches of the belt 51 where they pass through the-opening 58. The area vwithin the opening 58 between the reaches'of the belt 51 is '25 closed by a plate 68 having an up bent'ear 6I secured by rivets 62 to the cover plate 38. A pair cf lugs 63 punched out of the ear 6| engage bossesv 64 formed in the .cover platev 38 (see Fig. 22) sogas to securely position the plate 68.

A spring clip 65 secured. to the cover plate 38 isadapted to impress the head of a post 66. se-` cured to the belt housing 36 so as to hold'the cover plate in place. A pair of pins 61 (Figs. 15, 16, and 21) secured in the cover plate, engage in correspondingrecesses 68 formed in the belt housing 36 so as to properly position the coverv 38. Air currents flowing throughthe opening'59, induced by the suction within the suction chamber,v will impinge against and follow down along the reaches of the belt 51 as indicated by the arrows` 69 so as to prevent the belt from carrying dirt from the suction chamber up into the belt housing. Only one opening 58 is employed and this opening is positioned opposite the upwardly moving reach of the belt. The other reach will produce enough movement of air through the l opening through which it enters the suction houstary agitator. The likelihood of dirt being thrown into the belt housing by the agitator through the opening is slight because of the fact that said other opening is not above the upwardly moving point on the agitator and is not normal to any line of throw from the tips of the agitator elements. y

Mounted in the hub 45 are the agitating elements some of which comprise brushes 18 and others of which comprise beaters 1l. These agitating elements are mounted in'v recesses 12 (Fig. 16) in the hub and are secured by means of set screws 13 threaded through ears 14 formed in the hub and projecting slightly beyond the peits right end as in Fig. 16, ,eachset screw 13 is located on the right side of the element which it secures. This facilitates the ready removal or replacement of agitator elements as rotation of the agitator will bring each screw head successively into line with the operators screw driver.

The resilient beater element 1I (Figs. 18, 19, and 20) comprises a strip of rubber 16 one side of which is vulcanized into the beater strip or channel 11 and the other side of which is vulcanized into the backing channel 18. The rubber is bonded to these channels by a known processof bonding metal to rubber andwe nd that underthe most rigorous conditions of service these beaters will hold up for an indefinite period. The rubber is'of a very high grade high percentage gum content, very tough and very iiexible. The strip can be bent double without any injury whatever to the beater. The backing channel 18 is secured-in one of the slots 12, its edges substantially flush with the surface of the hub, and the beater strip 11 is separated from the hub by a substantial width of the rubber 'strip 16 so that as the beater contacts a suspended rug during rotation it will yield so as to cushion the blow as indicated in Fig. 17.

A lug 19, upstruck from the bottom of the channel 18, is molded into the base of the strip 16, and fills the space betweenthe side walls of the channel in line with the axis of the set screw 13. The lug 19 transmits the pressure of the set screw-13 from one side wall to the other of the channel thus preventing collapsing of the channel under the pressure of theset screw and assuring that the beater element will not fLv out of or work out of position in its socket, as would happen if the channel were not thus reinforced. This lug aids also in giving additional retention of the rubber strip in the channel.

The ends of the floor tool are formed with wheel sockets 88 which accommodate the supporting wheels 8|, the toe rollers 82, and the agitator bearing channels 50. The supporting wheels 8l .are journalled upon the crank throws 83 (see Fig. 8) of a crankshaft 84 extending just beneath the region 25 of the suction head. Downwardly opening slots 85 (Fig. 11) inthe inner walls of the rearwardly projecting portions of the wheel socketsl, accommodate the crankshaft 84 and allow the crankshaft and wheel assembly to be inserted as a unit or to be removed for servicing and repair. In the preferred form of the invention, the crankshaft is journalled in bearing` brackets 88 secured by means of screws 81 to the rear wall 24 of the suction head. The brackets 86 are placed in position on the shaft portion of the crankshaft 84 prior to the securing of the ends of the latter by means of pins 88 into the disk of the offset portions 89 of the crank throws 83. The brackets 86 rest against the inner wall of the sockets 80. The disks 89 slidingly engage the inner surfaces of said inner walls, bridging across the slots 85, so as to accul rately position the wheels 8l spaced from all walls yof the sockets. An adjusting lecver 98 is secured to the shaft 84 near one end. Its end is formed with a socket 8| (Fig. 8) in which a coil spring is pinned between one end of the socket and a shoulder 93 on a sliding latch pinl 84. The latter engages selectively a series of openings 85 (Fig. in a quadrant 98 secured by means of rivets 91 (Fig. 8) to one of the ,sockets 80. 'I'he quadrant 86 is L-shaped in cross section so as to provide a one-quarter cylindrical portion to engage against the rounded upper surface of the socket 80 and the down-turned flanged portionsin which are formed the openings 95. A scale plate 98 is secured to the Wheel socket 80 and has indicating characters 99 to locate the several positions of adjustment. Oscillation of the crankshaft 84 will raise or lower the wheels 8| relative to the suction head thus causing the latter to be bodily raised or lowered relative to the supporting surface, and consequently adjusting both the agitator and the mouth of the floor tool to the rug.

In Fig. 11a we have shown a modified form oi. the mounting in which the slots 85a are made to snugly receive the shaft 84 and in which the shaft 84 is held snugly against the upper extremity of the slot `05a by means of a bracket or latch element 86a.

The rug R is lifted from the oor by the suction in the suction head and suspended against the smooth curved lower surfaces of the lips |00, and between passages of the beating elements will become arched into the suction chamber. The vibration of the raised portion of the rug which is produced by successive blows of the beating element will throw the embedded grit up into the air stream, and the beating and brushing elements, rotating `forwardly in the lower regions of their orbits, will direct the air stream and the dirt particles iirst forwardly, thence upwardly, and thence rearwardly, as indicated by the arrows 3|, the dirt particles being impelled into the region 25 of the suction head at substantially a tangent to the cylindricalpath which has been followed in rising from the rug.

The neck 26 is provided with an insert IIII formed with an outwardly extending annular threaded flange |02, and the suction neck I5 has an out-turned flange I 03 held in -rotatable `engagement with theflange |02 by a flanged nut |04. -A stud |05 is riveted in the wall of the neck I5 closely adjacent the nut |04, and at the bottom of the nut. 'I'he stud |05 is adapted to engage against the side arms |06 (Fig. 14) of a yoke which arches above the neck I5 in va plane which intersects the stud |05. 'I'he side arms |06 are secured by screws |08 to the side regions of the vneck 26 and against lugs |09 formed in the neck 26, by means of which thel yoke is rigidly held in correct position.

The agitator motor is supplied with current through the auxiliary conductor ||0 one end of which is provided with a socket plug III which is plugged into a socket I| 2 secured to the sidev The socket II2'is connected in parallel within the dome'of the motor `|0 to the respective wires of the conductor I8 which carry current to the motor I0 from the switch 20.

The arch in the curve J is just sulcient to allow the handle' and fan assembly to be rotated 90 beyond Aits normal position shown in Fig. 2 in a counter-clockwise direction in which the conductor will lbe wrapped more snugly around the neck I5. The -stud will thencerengage the yoke |01 so as to prevent further movement. The position ofthe plug ||2 is such -that the conductor |I0 adjacent the plug will always remain tangent to the curve J, and so that no bending strain will be placed upon the conductor when it is pulled around the neck I5 to the extreme position just described. 'Ihe end of the conductor which enters the agitator motor is also arranged so that no undue bending of the conductor will occur at this point. The conductor is made as short as possible so that it will not unduly project to catch against objects during cleaning operations. The stopping of the rotation at 90 either side of center insures against the plug becoming accidentally pulled out of its socket.

The dust collector comprises the inner bag |I4 .of porouspaper having a reinforced neck I| 5 which is engaged in a coupling member IIB mounted in the fan discharge outlet I|'|. The bag III is of a rough creped porous paper, a section of the surface of which is illustrated in Fig. 5a, and which is illustrated in cross section in Figs. 4 and 5. This bag is rectangular in shape and snugly fits within the cover |I8 which has a longitudinal mouth extending from end to end of its upper region, deilned between the separable portions IIB of the side walls of the cover. 'I'he upper edges of these side Walls are stiiened as at |20 and are provided with end studs I2| detachably engaged by brackets |22 and |23. They are spaced apart when in place as shown in Fig. 3 to form the mouth |24. The cover ||8 according to the present invention instead of being formed of knitted textile material or woven cloth as has been the former practice, is made of an impregnated fabric or composition material which is impervious to air.

The floor tool is provided with bumpers |35 and |40, the former encircling the mouth of the suction head, and the latter, the motor casing 28. 'I'he bumper |35 is of novel construction in that instead of being faced with a continuous strip of metal, as in prior structures, it is provided with Washer inserts |36, bonded to the rubber in registry with openings |31 through which screws |38 are threaded into the wallsl 24 and sockets will be lifted also, lifting the rear rollers E from the floor. The cleaner is operated with the rollers E thus out of contact, andthe operator may thence vary the spacing of the agitator and suction head mouth from the iloor and vary the Vigor of beating by raising or lowering the handle, during operation. In securing this result, the presence of resilient beaters in the combination is an advantage, as they permit of a greater range of spacing of the agitator axis from the rug ln which beating may be performed. This is a decided advantage over that type of cleaner in which the only possible adjustment is secured by a change in the iioor tool mounting adjustment.

We claim:

1. In a suction cleaner, a suction producing unit including a prime mover, a floor tool attached to said unit. a rotary agitator in said floor tool, an auxiliary electric motor mounted upon the top of said iloor tool with its axis parallel to the axis oi said agitator, a drive pulley at one end of said motor, a casing covering said motor, a belt housing cover on the end ofthe casing, closed thereagainst and extending to the top wall of the floor tool, an 4opening in said wall, below said belt housing, a driven pulley on said agitator below-said opening, a belt travelling on said pul-y leys and extending through saidy opening andl an' air inlet betweenthe lower endo! saidI belt housing and said topwall, opposite the 'upwardly moving reach of said belt.

2. In a suction'cleaner, a suction producing unit including a prime mover, a oor tool attached to said unit, a rotary agitator in said oor tool, an auxiliary electric motor`mounted upon the top of said floor tool with its axis parallel to i 'integrally with rigid vertical channels in its end walls, a rotary agitator, shaft ends projecting from the ends thereof, a pair of bearing bushings loosely mounted on the respective shaft ends, said bushings being received in said channels and removable therefrom by 'sliding the agitator bodily downwardly, each bushing being in sub'- stantial contact simultaneously with both sides of its respective channel and spring detent means engaging the rounded side faces of said bushings and retaining them in the channels.

4. In a suction cleaner, a suction producing unit including a prime mover, a floor tool attached to said unit, a rotary agitator in said oor tool, an auxiliary electric motor mounted upon the top of said door tool with its axis parallel to the axis of said agitator, a drive pulley at one end of said motor, a belt housing on the end of the motor,

llso

walls, a rotary agitator, shaft ends projecting.

from the ends of said agitator, bearings rotatably mounted on4 the respective shaft ends, said bearings having portions received in said channels and removable therefrom by sliding the agitator bodily downwardly, and spring detent means engaging lateral regions of said portions and retaining them in the channels, said channels having at their upper ends shoulders against which said bushings Vseat so as to rigidly hold said agitator against being moved upwardly out of correct position when operating against a rug.

6. In a suction cleaner, a floor tool, a rotary agitator therein, an electric motor 'mounted upon the top of said floor tool with its axis parallel to the axis of said agitator, a drive pulley at one end of saidmotor, acasing covering said motor, a belt housing coveron the end of the casing closed thereagainst and extending to the top wall of the iloor tool, an opening in said wall, below said belt housing, a driven pulley on said agitator below said opening, a belt travelling on said pulleys and extending through said opening and an air inlet between the lower end of said belt housing and said top wall.

'7. In a suction cleaner, a oor tool, a rotary agitator therein, an electric motor mounted upon the top of said oor tool with its axis parallel to the axis of said agitator, a drive pulley-at one end of said motor, a casing covering said motor, a belt housing cover on-the end of the casing, closed thereagainst and extending to the top wall of the iloor-tool, coacting latching elements on the inner face of said belt housing and on the end of the motor, coacting positioning means on the housing and motor respectively, engaging each other, an opening in said wall, below said belt housing, a driven pulley on said agitator below said opening, and a belt travelling on said pulleys and extending through said opening.

8. In a suction cleaner, a floor tool, a rotary agitator therein, an electric motor mounted upon the top of said iloor tool with itsaxis parallel to the axis of said agitator, a drive pulley at one end of said motor, a casing covering said motor, a belt housing cover on the end of the casing, closed thereagainst and extending to the top wall of the. floor tool, coacting latching elements on the inner face of said belt housing and on the .end of the motor, an opening in said wall, below said belt housing, a vdriven pulley on said agitator below said opening, and a belt travelling on said pulleys and extending through said opening.

9. In a suction cleaner, a oor tool, an'electric ,motor mounted on said iloor tool with its axis parallel to the longitudinal axis on the floor tool, said motor having a drive pulley projecting from one end, a casing covering said motor, an openingin the floor tool below said drive pulley,

a rotating agitator revolvably mounted in the oor tool, a driven pulley on such agitator located below said opening, a belt travelling on said pulleys and extending thru said opening, said licor tool having a cleaning mouth at its bottom, and said agitator being detachably mounted and removable bodily thru said mouth, said belt being detachable by the act of dropping its upper region thru said opening and thence dropping the belt and agitator together downwardly thru said mouth, and being attachable by a reverse process, and a belt cover attachable to the end of said casing and forming therewith when attached, a housing completely enclosing that portion of the belt which projects above the top of the floor tool, said'cover being detachable so as to expose all of said portion extending above the top of the floor tool for manipulation-thereof.

10. In a suction cleaner, a iioor tool, a rotary agitator therein, an electric motor mounted upon the top of said oor tooll with is axis parallel to the axis of` said agitator, a drive pulley at one end of Asaid motor, a casing over said motor, a belt housing cover on the end of the motor casing, closed thereagainst and extendingto the top wall of the oor tool, coacting latching elements on said belt housing and on the end of the motor, an opening in said wall, below said belt housing, a driven pulley on said agitator below said opening, and a belt travelling on said pulleys and extending through said Y 

